Vibrating screen or separator.



W. J. BELL & T. L. 6; T. J. STURTEVANT.

VIBRATING SCREEN OR SEPARATOR.

APPLIGATION FILED 0014, 1907.

Patented May 25, 1909.

VIBRATING SCREEN OB SEPARATOR.

APPLICATION FILED 00124, 1907.

-' Patented May 25, 1909.

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WILLARD .l. BELL, Oh NEWAYGO, MICHIGAN, AND THOMAS LEGGETI STURTEVANT,0F QUIN(JX, AND 'll'lQMAS JOSEPH STURTEVANT, OF WELLESLEY,MASSACHUSETTS; SAID 'l. L. AND 1. J. SlUlvTlEVAN'l ASSIUNORS TO SAIDBELL.

'VIBRATING SCREEN 0R SEPARATOR.

Specification of Letters Patent.

Patented May 25, 15509.

1 Application filed October 4, 1907. seihino. 395,935.

1m1f/.l.i1.-/wm it may concern:

llc it known that we, \Vmmnn J. BELL,1'L-- aiding. at N'mvaygo, in thecounty of Newaygo, State of i\lichigan; 'lnonas L. S'ri'irrrnnx'r.residing at Quincy, county of Norfolk, State of :dassachnset ts, andTHOMAS J, li'lllt'lI-IVANI, residing at lVellesley, in the county ofNorfolk, State of Massachusetts,

have invented certain new and useful IMF device ot such constructionthat the vibra lions ot' the screen will be as free as possible, as alsoto protect the screen surface from being injured by the percuimechanism, and to hold the s .reen surface at all times under anautomatic elastic tension.

in the acconipanying drawings Figure 1 is an elevation of the improvedmachine, and Fig. 2 a vertical section of the same.

Figs. 3 and --l are detail views of the screen frame and screen.

I lte'l'erring to the drawings, 12 denotes a suitable framework onwhichthe screen box 13 is suitably supported in an inclined position,provision being preferably made for changing the angle of inclination ofthe said screen box by providing the upper ends of the longer uprightsor posts of the frai-ne with a series of holes 1,4 in any one otf whichmay be placed a cross bolt 15 which secures the upper end of the screenbox to the said posts. To the bottom piece or frame to of the screen boxsuitable springs .17 are attacheth said springs elastically supportingthe screen frame lb. The said frame may be 'n'ovided with an upperscrccn it) and a lower screen 20, as in the construction shown by thepatent referred to, said upper-screen being course! than said lowerscreen. it is, however, not essential that our improved constructionshouldinclude two screens oiidiflerentmesh, as for some classes of workonly a single screen may be desired.

"In order to ccure the best possible vi ive vibrating brating results itis necessary that the Wire cloth of the screen should be kept under anelastic tension, and to this end one of the side pieces 18 of the screenframe, to which the wire cloth is attached, is preferably slidablymounted in the top and bottom piece of the said frame, and the wirecloth is kept under -a strong elastic tension by springs 21 encirclingcross rods 22 which push outward against. the opposite side pieces ofthe frame, and by means of which springs and cross rods the wire cloth'or' screen proper attached to the frame will be stretched orkeptvautomatically under a strong elastic tension. This automaticelastic tension of the screen we consider very important.

Attached to the bottom piece 16 of the screen box are hollow guides 23in which are mounted sliding strikers or impact bars 24 by whichpercussive vibrations are imparted to the screen; said impact bars beingacted on by swinging hammers 25 carried by rotating arms 26 driven fromthe shafts 27 journaled in suitable hangers 27" depending from thebottom of the screen box. The impact bars 25 are proyidcd with slots 28through which pass pins 29 which Will'prevent said bars from slidingdown and out of the hollow guides 23; said impact bars retiring orfalling, by gravity, away from the screen after having been forcedupward percussivcly by the rotating hammers By arranglng these slidingimpact bars below the screens, instead of above the same, as in theconstruction of the patent hereinbefore mentioned, the said impact barswill not. remain in contact With the screen under theinfiuence of.gravity, in such a manner. as to check the v brations or lfllllllgmoveinents thereoflbutwill retire therefrom immediately after thepercussive strokes.

The jarring impulses of the strikers or im-.

or parts being provided with depending flanges surrounding andoverlapping the dpper ends of the hollow guides 23,-so as to prevent thescreened material from passing into said guides. These protecting stripsprevent the screen surfaces or delicate'wirecloth screens from beingdamaged by the percussive hammer strokes acting through the impact bars.

, by suitable sprocket earing.

In order that the hammers 25 may give sudden quick percussive strokestothe strikers or impact bars 24:, and thus avoid drag of the sand hammersover said strikers or,

bars, the lower ends of the latter will preferably be rounded and theends of the hammers likewise rounded to enable or permit the saidstrikers or impact bars to drop by gravity or be otherwise caused torebound, or be removed as by the action of springs, as soon as they havedelivered their percussive blows.

The screen box 13 is-preferably provided at its'upper side with suitablehinged covers 36 to permit of access to the chamber of the said box; andthe upper end of said box is also provided with a hinged door 37 throughwhich the screen frame and screen may be inserted into or removed fromthe chamber of said box.

To prevent the screen-frame from lifting under the impulse of thevibrating posts or bars any suitable means, as the cross rod 38 at thelower end of the screen frame, may be provided.

Y By arranging the strikers or impact bars I 24 and their operatingmechanism below the screen frame, instead of above, as in theconstructionof the patent, hereinbefore referred to, the percussive)arrmg or vibrating mechanisn'i will be out of the way, so that thescreen may be inserted -1nto or removed from the screen box moreconveniently than with the former construction.

, Having thus described our invention we claim and desireto secure byLetters Patent:

1. The combination with a wire cloth screen, of a frame on whichsaid-screen is mounted, -means, comprising stretchmg springs mounted onthe said frame, acting on said wire cloth screen and serving to hold thesame under elastic tension in said frame jured by the percussivemechanism..

Icloth screen, of a frame-work on which the 2. Thecombination with aninclined, wire same is sustained, means for changing the angle ofinclination of the said screen, means for imparting percussive vibratingmovements thereto, and one or more stretching springs mounted on saidframe and acting on the said Wire cloth s reen and serving to hold thescreen surface under elastic tension relative to the bars of said frame.

3. 111 a separator, the combination with a wire cloth screen, of a frameto which said screen is attached, and which-frame comprises a looselymounted side member, one or more springs, cooperating with said sidemember, for automatically maintaining said screen under elastic tension,and percussive jarring means for vibrating said screen.

4. In a separator, the combination with a substantially rectangularframe having one of its side members slidably mounted on the twoadjacent end members, one or more springs for exerting a yieldingpressure upon said slidably mounted member, a wire cloth screen attachedto said slidably mounted member and to the other members of said frame,and percussive jarring means for vibrating said screen.

5. The combination with an inclined, spring-supported,wire cloth screen,of mechanism arranged below the same and serving to impart percussivevibrating movements thereto, a frame on which said screen is mounted,and one or more stretching springs acting on the said wire cloth screenand serving to hold the same under elastic tension relative to the barsof said frame.

(3. The combination with an inclined,springsupported wire-cloth screen,of stretching face and comprising hammers and impact bars acilrpercussively on the screen from below the same, and means for-protectingsaid screen from being damaged by the percussive hammer strokes.

3. The combination with an inclined, springsupported screen, ofmeans,.comprising stretching springs, for maintaining the screen surfaceunder elastic tension, sliding impact bars arranged below said screen,so as to retire therefrom by the action of gravity, for impartingpercussive vibrating movements thereto, hammers arranged to .strike saidimpact bars, and protecting means for preventing the screen from beinginjured by thev percussive hammer strokes.

9. The combination with an inclined, spring-supported screen, ofstrikers or impact bars normally out of contact with said screen,hammers for causing said strikers v or impact bare {cgintermitti'nglyaetg ()Ilsfiid n, hemmera ior i g said strikers 1 1 manefer holding e sari screen under d i teaeien a '10-: The eembinationwith-"aw p g-s paeree, and hammers for causingsaid strikera 61 impactbars-to act .mtermlttmgly 0n sai fQrthepumose of vibratmg qr Jamie theame."

, 11. Lhc combination with an inclined,

spring=sup orted screen, of retiring strikers-- 1'5 said screcn andhammers for causmg said or impact are normally out of contact withetrikers'or Impact bars to act'on said .screen same, sald impactjbarsand ammers having.

bars.

b (WW and ndrmally Bellaout of cont'act'with said gcrefen, hammers fer ui g said "strikerarer impact. bars' t ai i ct an eaid' screen 91? thepurpcee of vibratgflia game and means "for holdmgthe sald eereen underelastic tension. 18. combination with aninclined,

spring-supported screen; ofineans \vwrhereley the angle, of inclinationof sai d'screenz may be vii-med retiring impact .bars,-. arrangedbeneath'and normally out of contact 'I r sa1d screen and actmgpercussrvelypn sald-v Screen, for jarring or. ibratin'g ,the same, andmeans for operating sald lmpacbbars.

z 14.; The combination with an inclined,

sprin -supported ,scfeen', bf means whereby the angle-of inclination ofsaid screen may neat-h and normally but of contactwith said -s c1"eenand. acting percussively 6n said screen, for jarring or vibrating thesame, means for Operatmgsard 'lmpactbars, and

In teatimeny wherec'fwe afiix cur sig- I namreaiu presenceof'two'Witnexses V I rounded ends to avoid drag of, the said ham; r -mersoversaid y "912.1'11'16 combination with animliged, spring-supportedscreen, of recirmggtrikera a -01 impact bars arranged WILLARD 3-. BELL.r

"THOMASJOSEPHgSTURTEYANTQ rWItIIGSSQS- to the v srg'natrl re. OfWflIar-d J.

v Ror G; Scormw. Witnesses 'to-the signatures of Thcs R BEBT M, GAY,"

- HENRY A. TOMLINeON'.

be varied, sliding'impact bars, arranged be:

' means for'holdingtghe screen 'snrface under 7 "elastictensicm, Q

f01'-tl1e l1I"pOSe 0f vibratin -or jarring the EHOMAS LEGGETTSTURTEVANT,

Lows 1 f

